6. Suppose that the following information represents the complete trade data for each country.

	Exports ($)	Imports ($)
Country A Good X Good Y Good Z	8,000 12,000 10,000	4,000 5,000 0
Country B Good R Good S Good T	0 1,900 1,600	7,000 9,000 3,000
Country C Good M Good N Good O	8,000 5,000 5,400	3,400 2,500 2,800

(a) Calculate the intra-industry trade index for each commodity category in each country.

(b) Calculate the intra-industry trade index for total trade in each country.

(c) Use trade theory to explain the usefulness of these indices in determining each countrys trade patterns.

Note: You may use either the Balassa index or the Grubel-Lloyd index for your calculations.